State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 511 Kehua Street, Tianhe District, Guangzhou 510640, China.
Environ Pollut. 2009 Oct;157(10):2704-9. doi: 10.1016/j.envpol.2009.04.031. Epub 2009 May 24.
This study investigated the dissipation kinetics of oxytetracycline in soils under aerobic and anoxic conditions. Laboratory experiments showed that the dissipation of oxytetracycline in soil followed first-order reaction kinetics and its dissipation rates decreased with increasing concentration. Oxytetracycline dissipated faster in soil under aerobic conditions than under anoxic conditions. The half-lives for oxytetracycline in soil under aerobic conditions ranged between 29 and 56 days for non-sterile treatments and 99-120 days for sterile treatments, while under anoxic conditions the half-lives of oxytetracycline ranged between 43 and 62 days in the non-sterile soil and between 69 and 104 days in the sterile soil. This suggests microbes can degrade oxytetracycline in agricultural soil. Abiotic factors such as strong sorption onto soil components also played a role in the dissipation of oxytetracycline in soil.
本研究探讨了在有氧和缺氧条件下土壤中土霉素的消解动力学。实验室实验表明，土霉素在土壤中的消解遵循一级反应动力学，其消解速率随浓度的增加而降低。土霉素在有氧条件下的土壤中比在缺氧条件下消解得更快。在有氧条件下，非无菌处理的土霉素在土壤中的半衰期在 29 到 56 天之间，无菌处理的半衰期在 99 到 120 天之间，而在缺氧条件下，非无菌土壤中土霉素的半衰期在 43 到 62 天之间，无菌土壤中的半衰期在 69 到 104 天之间。这表明微生物可以降解农业土壤中的土霉素。非生物因素，如强烈吸附到土壤成分上，也在土霉素在土壤中的消解中发挥了作用。
